Model 121 Div 2 Hazardous Locations
"Piston Type"
Differential Pressure Switch / Transmitter
Electrical Configurations E, F & W
Class l, Division 2, Groups A, B, C & D
Class ll, Division 2, Groups F & G
Certifications: 
- CSA Certified to Canadian and US Standards
Dimensions:
See 121_dimension_haz_loc
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Product Features/Benefits
- Indication and Pressure Containing Element design identical to Standard product
- Lower Cost when Compared to Explosion-proof designs
- Similar to 120 Division 2 product Except with Field Wireable Terminal Strip (Separate Junction Box not required)
- CSA Listed to Canadian and US Standard (Switch and transmitter)
- Ranges, Scales, Dial Sizes, Ports, Elastomers etc. available are equivalent to Non-Hazardous Location product
- Hermetically Sealed Switch Design
Seal not required
- Aluminum Weatherproof NEMA 4X Electrical Enclosure with 1/2" FNPT Conduit entry
- No Input Power required to operate the switches; Transmitter requires 8-28 Vdc Loop Power
- For complete model details See BULLETIN_121
- Installation and Operation Manual (Refer to Hazardous Locations section. Electrical Configurations E, F, or W) ELECIOM_121
Specifications / Configuration
- Working Pressures Hazardous Locations Model 120:
Aluminum 3000 PSIG;
Stainless Steel: 5000 PSIG;
Note: Not available with Monel or Al-Br
- Operating Temp:
Switches: -40°F to +200°F (-40°C to +93°C)
Transmitter: -20°F to 150°F (-29°C to 65°C)
Electrical Specifications:
See Bulletin: Specificationsheet_121 Refer to Electrical Configurations E & F, & W
Switch Electrical Specifications: See Bulletin: ELECIOM_121
Mid-West Hazardous Locations Indicating / Non-indicating switch (Electrical Configurations E or F) is intended for use in Division 2 hazardous Locations.
- 1 or 2 Independently adjustable SPST or SPDT Switches
- Weather-proof NEMA 4X Rated enclosure with ½”FNPT Conduit
- Field Wireable Terminal Strip – Wire range 22Awg to 16 Awg
Parameter |
SPST (Normally Open) (Normally Closed) |
SPDT |
Option |
E, F, G |
A |
*Power |
60 Watt |
3 Watt |
Maximum Current |
3.0 Amps |
0.25 Amps |
Maximum Voltage |
240 VAC/VDC |
125 VAC/VDC |
Switch Setting
%Full Scale |
20 to 95 |
15 to 95 |
Hysteresis
Maximum/Nominal |
18% / 10%
Full Scale |
12% / 8% |
Repeatability |
1% Full Scale |
1% Full Scale |
* Product of the switching Voltage and Current Shall not exceed the Power Rating.
Transmitter Specifications: See Bulletin: ELECIOM_121 (Electrical Configuration W)Transmitter Configuration “W”, Model 121 Transmitter is intended for use in Division 2 locations . The Model 121 indicating / non-indicating differential pressure transmitter is a 2 wire loop powered microprocessor based 4-20 ma transmitter. The magnetic angle sensor & electronics senses the angle (relative to the transmitter sensor) of the magnet which moves linearly in the bore. Each transmitter is individually calibrated to the gauge using an 11 point calibration linearization technique. This method results in a <2% full scale accuracy for the upper 80% of the range.
- 4-20mA Loop Powered Micro Processor based Transmitter
- 4 Position Terminal Strip 22 AWG – 16 AWG
- 8-28 VDC Loop Powered 2-wire interface
- 1000 Ohm max loop resistance at 28 Vdc.
- ±2% Accuracy from 20% to 100% of scale, ascending
- Indicator operation is isolated from Loop Power
- Weather-proof NEMA 4X Rated enclosure with ½”FNPT Conduit
Additional Options:
- Pipe Mounting kit - 2" U-Bolt
- Wall Mounting (not available with back connections)
- Liquid Fill
- Maximum Indicator Follower Pointer
Model 121 Div 2 Hazardous LocationsDocuments
“Piston Type” Hazardous Locations Product
“Diaphragm Type” Hazardous Locations Product